Hi trying unsuccessfully to find an old style mechanically operated car alarm where the slightest movement would set it off, which used to be a real nuisance years ago if it was a windy day or someone bumped into the car accidentally. However it's needed for my 1983 Audi 100 GL5E that will be kept in storage as by passing electronic ones are much too easy these days. I think they were based on a simple pendulum that would go off when moved but drawn a blank so far so could anyone recommend where to find one ?